The characteristic time obtained from dimensional analysis offers a reference value for computational time step.
量纲分析得到的特征时间为计算时间步长提供了参考值。
The time step is very small for the transient analysis of nozzle jet flow, which occupied numerous computational resources.
由于冲击式水轮机三维自由射流是两相流，进行瞬态计算的时间步长必须非常小，这就需要大量的计算资源。
Comparing with the classic finite element method, WPIM belongs to a half analytical method, it is not sensitive to the time step, so this is helpful to improve the computational efficient.
与传统的有限元方法相比，本文方法属于半解析方法，对时间步长不敏感，可有效提高计算效率。
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